121853

Properties

Appears in sequences

• a(n) = floor(n(n-1)(n-2)(n-3)/18).at n=40A011928
• Number of permutations in S_n avoiding 1{bar 5}324 (i.e., every occurrence of 1324 is contained in an occurrence of a 15324).at n=9A137539
• Somos-4 variation with periodic coefficients.at n=11A185160
• Index in A092243 where -n first appears.at n=31A269738
• Prime numbers such that the product of their digits equals twice the number of their digits times the sum of their digits.at n=12A343701
• Prime numbersat n=11462